The rigid bar BDE is supported by two links AB and CD. Link AB is made of aluminum (E = 70 GPa) and has a cross-sectional area of 500 mm². Link CD is made of steel (E = 200 GPa) and has a cross-sectional area of 600 mm². For the 30-kN force shown, determine the deflection (a) of B, (b) of D, and (c) of E.